Clamp.



H. A. HASKELL.

CLAMP.

APPLICATION FILED mums, 1911.

1,047,519, Patented Dec. 17,1912.

15 7 Q ml 1m InvenL br, Henryfl.Has76eU Wi'fizesses;

HENRY A. HASKELL, 0F BRAINTREE, MASSACHUSETTS.

CLAMP.

inertia.

Specification of Letters Patent.

Patented Dec. 17, 1912.

Application filed June 26, 1911. Serial No. 635,433.

7. 0 aZZ whom it may concern:

Be it known that I, HENRY A. HASKELL, a citizen of the United States,and a resident of Braintree, in the county of Norfolk and Commonwealthof Massachusetts, have invented certain new and useful Improvements inClamps, of which the following is a specification.

The object of this invention is the construction of a three-jawed clampby means of which to hold together various shaped parts while beingglued or otherwise permanently united.

This clamp is especially adapted for temporarily holding together themitered ends of picture frame members, and of irregular blocks of woodbeing shaped into patterns.

Referring to the drawings forming part of this specification, Figure 1is a plan view of a clamp embodying my invention. Fig. 2 is a sectionalview of a part thereof. Fig. 3 is a sectional view on the line XX inFig. 1. Fig. 4 is a side view of the third clamping jaw. Fig. 5 is aplan view of the three jaws represented as holding a triangular block.Fig. 6 is a similar view showing the jaws clamping a block to the end ofanother. Fig. 7 is a plan view of a modified form of the third jaw.

The twin jaws 1 and 2 of this clamp are pivotally attached to the outerends of the lever-arms 3 and at which are fulcrumed at 5 and 6 to thecross bar 7. For swinging these jaws toward and from each other, theinner ends of the lever arms are joined by links 9 and 10 to a crosshead 11 in which is rotatably mounted a terminally threaded rod 12. Oneend of the latter is rigidly held by the handle 13, while its threadedend turns in a correspondingly threaded hole in said cross bar 7. Whensaid handle is turned in one direction, said cross bar and cross headare drawn together and the links 9 and 10 are made to force the innerends of the lever arms apart, and hence the twin jaws toward each other.WVhen the handle is turned oppositely, said jaws are moved apart.

The third jaw 14 is removably secured to the outer end of the rod 15whose inner end is threaded and slidably fits an opening in said crossbar. A milled nut 16 turns on this threaded section and thereby servesto draw said rod and the jaw 14 inward.

As shown in Fig. 4, the rod 15 is inserted Within a hole in the jaw 1 1and held therein by a set screw 17, in order that said jaw may bechanged to present either its mitered face 19 or its plane face 20 tothe work.

In using this clamp for mitered frame members, as 21, 22 shown in Fig.1, the milled nut 16 is turned and also the handle and rod 13, 12, untilthe three jaws are presented to said members substantially asillustrated, the twin jaws being angular-1y adjusted to seat flatlyagainst said members. Said handle is then turned up slightly more toforce the twin jaws toward each other and thereby tightly clamp theparts together. For this work, the third jaw is shifted to present itmitered face inward.

For the block shown in Fig. 5, the third jaw is shifted to present itsplane face inward; as also for clamping-a block 23 to the end of anotherblock 24:, as shown in Fig. 6. For curved or circular work, an extrathird jaw is provided with a concave face 25 instead of the plane facefirst described, as shown in Fig. 7.

I usually provide the clamp with short legs 26, as shown in Figs. 2 and3, for better supporting the clamp when it and its work is laid upon abench or other flat surface.

It is evident that the twin jaws can be employed for clamping purposeswithout the third jaw, it being only necessary, in the event of thethird jaws being in the way, to unscrew the milled nut and remove thesame.

It is also evident that by applying the milled nut to the rod 15 betweenthe cross bar 7 and the third jaw, and by presenting the twin jawsopposite to each other, the three jaws can be made to press outward froma common center and thereby be used for clamping parts to the sides ofan opening in the work.

This tool may fairly be called a universal clamp, because of the varietyof the uses to which it can be put.

What I claim as my invention and for which I desire Letters Patent is asfollows, to wit A clamp comprising two lever arms, a cross barterminally pivoted to intermediate points of said arms, a cross head, athreaded rod operat-ively engaging said cross bar and rotatively held bysaid cross head, means whereby the rotation of said rod forces said armsto swing relative to each other, a invention, I have hereunto set myhand this threaded rod longitudinally slidable in said 23rd day of June,1911. cross bar a mitered 'aW carried b the latter and a thiunb nut turning on the last-named HENRY HASKELL' rod for moving said mitered jawtoward the Witnesses: said arms. HAZEL LoTHRoP,

In testimony that I claim the foregoing CARL P. LOTHROP.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

